<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<!--
			都是块级元素
		-->
		<div class="web">
			<header>
				<nav>导航</nav>
			</header>
			<section>
				<aside>侧边栏</aside>
				<article>主体</article>
			</section>
			<footer>页脚</footer>
		</div>
	</body>
</html>
